Most shooting attacks are not aimed at specific foes, but fired indiscriminately into a knot of troops. Those shots aimed more carefully are greatly feared, for no chieftain or general is safe from their vengeance.
Source: Warhammer Armies Project: Unofficial 9th Edition (v2.2)
SniperURL Copied!
A model with the Sniper special rule can make a special Sniper shot instead of shooting normally (though it can be used in combination with the Multiple Shots rule as normal). A Sniper shot suffers an additional -1 To Hit penalty, in addition to any other modifiers, but can be aimed with great precision. Unless making a Stand and Shoot charge reaction, a model making a Sniper shot can shoot at a different target from the one chosen by their unit. A hit from a Sniper shot is not distributed in the same manner as other shooting attacks. The Sniper can shoot at any model they can see, including characters within a unit. "Look Out, Sir!" cannot be used. Sniper cannot be used when firing weapons that use a template.